S. Martin - Word-of-mouth in the health care sector: a literature analysis of the current state of research and future perspectives - International Review on Public and Nonprofit Marketing, Vol. 14, No. 1, 2017, pp. 35-56
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S. Martin - Engaging stakeholders through Facebook: A study of German and Austrian public utility companies - Paper for the International Research Society for Public Management 2014 , 2014, pp. 1-23
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